Cirsium boninense

Cirsium boninense is a species of thistle in the family Asteraceae that is endemic to the Bonin Islands of Tōkyō Metropolis, Japan.^[1][2]

Cirsium boninense
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Cirsium
Species:	C. boninense
Binomial name
Cirsium boninense Koidz.[1]

Taxonomy

The species was first described by Japanese botanist Gen-ichi Koidzumi in 1914.^[1] The specific epithet relates to the type locality (Chichijima) in the Bonin Islands.^[1]

Description

Cirsium boninense is a perennial plant with white flowers from May to June that grows to a height of 40–150 centimetres (16–59 in) among the grasses and rocks in coastal areas, as well as on the forest floor.^[3][4]

Conservation status

Cirsium boninense is classed as Near Threatened on the Ministry of the Environment Red List.^[5][6] According to the Red Data Book Tokyo, though decreasing on Chichijima, numbers are increasing on Muko-jima [ja] and Nakōdo-jima.^[3]

See also

• Cirsium toyoshimae

References

1. Koidzumi, G. (1914). "Plantae novae Japonicae II". The Botanical Magazine (in Latin). 28 (331): 171–173 [172]. ISSN 0006-808X.
2. Katō, M. [in Japanese]; Ebihara, A. [in Japanese] (March 2011). 日本の固有植物 [Endemic Plants of Japan] (in Japanese). Tokai University Press. pp. 138, 258, 373. ISBN 978-4-486-01897-1.
3. オガサワラアザミ [Cirsium boninense] (in Japanese). Tokyo Metropolitan Government. Retrieved 7 May 2022.
4. オガサワラアザミ [Cirsium boninense] (in Japanese). National Museum of Nature and Science. Retrieved 7 May 2022.
5. 維管束植物 [Vascular Plants] (in Japanese). Ministry of the Environment. 27 March 2020. Retrieved 7 May 2022.
6. Ministry of the Environment, ed. (2015). レッドデータブック2014 —日本の絶滅のおそれのある野生生物— 8 植物I（維管束植物） [Red Data Book 2014 — Threatened Wildlife of Japan — Volume 8, Vascular Plants] (in Japanese). Gyōsei Corporation. p. 613. ISBN 978-4-324-09902-5.